And the unorganized militia has no rights, duties, or responsibilities and is merely a pool that the organized militia (the NG) may draw its members from.

Many states also have a state defense militia of volunteers that is not related tot he NG. Ohio's may be called by the governor. I believe this is the organization that would really pull from the pool legally.

All of these things have faded simply because bringing an occupying land force onto US soil is nearly impossible. Taiwan has the ability to hold the entire Chinese land based military at bay with stealth boats we sold them. Shoulder fired anti-air rockets have become(relatively) cheap. Not saying the US does not have weak spots, but getting a land force to our coast/border and to maintain its supply lines is just very unlikely so no one puts much thought into what to do if it happens.